<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Barcode
 * @subpackage Object
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Postnet.php 23775 2011-03-01 17:25:24Z ralph $
 */

/**
 * @see Zend_Barcode_Object_ObjectAbstract
 */
require_once 'Zend/Barcode/Object/ObjectAbstract.php';

/**
 * @see Zend_Validate_Barcode
 */
require_once 'Zend/Validate/Barcode.php';

/**
 * Class for generate Postnet barcode
 *
 * @category   Zend
 * @package    Zend_Barcode
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Barcode_Object_Postnet extends Zend_Barcode_Object_ObjectAbstract {
	
	/**
	 * Coding map
	 * - 0 = half bar
	 * - 1 = complete bar
	 * @var array
	 */
	protected $_codingMap = array (0 => "11000", 1 => "00011", 2 => "00101", 3 => "00110", 4 => "01001", 5 => "01010", 6 => "01100", 7 => "10001", 8 => "10010", 9 => "10100" );
	
	/**
	 * Default options for Postnet barcode
	 * @return void
	 */
	protected function _getDefaultOptions() {
		$this->_barThinWidth = 2;
		$this->_barHeight = 20;
		$this->_drawText = false;
		$this->_stretchText = true;
		$this->_mandatoryChecksum = true;
	}
	
	/**
	 * Width of the barcode (in pixels)
	 * @return integer
	 */
	protected function _calculateBarcodeWidth() {
		$quietZone = $this->getQuietZone ();
		$startCharacter = (2 * $this->_barThinWidth) * $this->_factor;
		$stopCharacter = (1 * $this->_barThinWidth) * $this->_factor;
		$encodedData = (10 * $this->_barThinWidth) * $this->_factor * strlen ( $this->getText () );
		return $quietZone + $startCharacter + $encodedData + $stopCharacter + $quietZone;
	}
	
	/**
	 * Partial check of interleaved Postnet barcode
	 * @return void
	 */
	protected function _checkParams() {
	}
	
	/**
	 * Prepare array to draw barcode
	 * @return array
	 */
	protected function _prepareBarcode() {
		$barcodeTable = array ();
		
		// Start character (1)
		$barcodeTable [] = array (1, $this->_barThinWidth, 0, 1 );
		$barcodeTable [] = array (0, $this->_barThinWidth, 0, 1 );
		
		// Text to encode
		$textTable = str_split ( $this->getText () );
		foreach ( $textTable as $char ) {
			$bars = str_split ( $this->_codingMap [$char] );
			foreach ( $bars as $b ) {
				$barcodeTable [] = array (1, $this->_barThinWidth, 0.5 - $b * 0.5, 1 );
				$barcodeTable [] = array (0, $this->_barThinWidth, 0, 1 );
			}
		}
		
		// Stop character (1)
		$barcodeTable [] = array (1, $this->_barThinWidth, 0, 1 );
		return $barcodeTable;
	}
	
	/**
	 * Get barcode checksum
	 *
	 * @param  string $text
	 * @return int
	 */
	public function getChecksum($text) {
		$this->_checkText ( $text );
		$sum = array_sum ( str_split ( $text ) );
		$checksum = (10 - ($sum % 10)) % 10;
		return $checksum;
	}
}
